I. ARCHITECTURE.--Evolution of the Modern Mill.--By C. J. H.
WOODBURY.--Continuation of this Sibley College lecture, treating
of the practical details of mill structures. 10346
II. ASTRONOMY.--Changes in the Stellar Heavens.--By J. E. GORE,
F.R.A.S.--Changes of color, brightness, and position in the
fixed stars as attested to by the records of the ancient and
modern astronomers. 10355
Distance and Constitution of the Sun.--Modern theories of the
sun and difficulties in formulating a satisfactory explanation
of all of its phenomena. 10354
III. BOTANY.--The Common Dandelion.--By FREDERICK LEROY
SARGENT.--The properties and life history of this common plant.--
Its wonderful seed-distributing apparatus.--8 illustrations. 10355
IV. CHEMISTRY.--Poison of the Somalis extracted from the Wood of
the Ouabaio.--A recently investigated plant principle. 10358
V. CIVIL ENGINEERING.--Test of a Wrought Iron Double Track Floor
Beam.--By ALFRED P. BOLLER.--A test pushed to actual rupture of
a full-sized member of a bridge.--1 illustration. 10344
Timber and Some of its Diseases.--By H. MARSHALL WARD.--Part V.
of this exhaustive treatise of the deterioration of one of the
great structural materials.--1 illustration. 10345